The nonprofit, nonpartisan public interest group made the case against the deal in letters to both the Department of Justice and the Federal Trade Commission. Both agencies have the authority to scrutinize acquisitions for antitrust concerns. While the deal is above the threshold requiring approval, it is not yet clear which agency will handle it.

“Google already dominates the online mapping business with Google Maps. The Internet giant was able to muscle its way to dominance by unfairly favoring its own service ahead of such competitors as Mapquest in its online search results,” wrote John M. Simpson Consumer Watchdog Privacy Project Director. “Now with the proposed Waze acquisition the Internet giant would remove the most viable competitor to Google Maps in the mobile space. Moreover, it will allow Google access to even more data about online activity in a way that will increase its dominant position on the Internet.”

“You should take Bardin at his word,” wrote Simpson. “Approval of the Waze deal can only allow Google to remove any meaningful competition from the market. It will hurt consumers and hinder technological innovation. If the acquisition comes before the you, I urge you to reject it in the strongest possible terms.”

The FTC’s earlier approval of the DoubleClick acquisition tipped Google to a search advertising monopoly, by giving Google most all of the users, advertisers and website publishers that Google did not have, Consumer Watchdog said. The Commission’s approval of the acquisition of the mobile advertising company AdMob extended Google’s monopoly to mobile. The Internet giant now has a 93% share of mobile online advertising.